Silica analysis report, Residential Sampling Project, Dec 2001

NYC 9/11 Public Portal Document

107 ffaddofi Avenue 4EMSL^EMSL Analytical, Inc.- West/nant, NJ. 08108 (856) 858-4800 12/26/01 Aneatian: U.S. EPA HQ Financial Services Division 1200 Pennsylvania Avenue NW Maildrop 2734R Washington, DC. 20460

Project: Residential Ref. Number: 360100701

Silica Analysis Performed by Method MOSH 7500 Crystalline Particle Analysis Performed by X-Ray Diffraction (XRP)___________ Nuisance Dust Airfiarne Pariicutate I Sample Sample Analjle AnnlyK % Analylical Weight Cone. Weicht Cline. An.ilj'te Sample ID Identification Analyte ID Volume (mg/m’) (iine) (m^/m’) (>ne/m^) (mg) (y [RJRF-R2-23 Quartz 1014 A N/A <0.004 <AS N/A 0.0039 Crlstoballle <0.012 <AS 0.0118 Tridymite N/A N/A N/A Calcite <0.004 <AS 0 0939 Poruana/ Lime <0.020 <AS 0.0197 Gypsum <0.004 <AS Q.ooaa Mica <0.011 cAS 0.0109 Haliie <0.006 <AS 0.0059 Fionus Glass NO «AS 0.S8S4

[R1RF2-R2-2S Quartz 1584 0.033 0.0208 <0.004 <AS N/A 0.0025 Cristobalite <0.012 <,AS 0.0076 Tridymita WA N/A N/A Calcite <0.004 <AS 0.0025 Portland/ Lime <0.020 <AS 0.0120 Gypsum <0.004 <AS 0.0025 Mica <0.011 <AS 0.DD69 Hallie <0.003 <AS 0.0033 Fibrous Glass NO <.AS 0.6313

lR]TF-R2-23 Quartz 1592 0.052 0.0389 <0.004 <.xs N/A 0.0025 Cri-siobaiite <0.012 <AS 0.0075 TridymitB :N/A N/A k/A Calcite <0.004 <AS 0.0025 Portland/ Lime <0.020 <AS 0.0126 Gypsum <0.004 <AS 0.002S Mica <0.011 <,ts 0.0069 Halite <0.006 <AS 0.0033 Fibmus Glass NO <AS 0.5262 Fitmus Cf.^as Peau/ts in fibers ficr cubic

John Newton 26 December, 200] Analyst Pate of Analysis

Disclaimer: The laboratory can only veri^ the conceattations of analytes on the filter and nof tlie Cnal cunceatrnfinns due w data obuined by non-laboratoty pcisonnd. In tlie absenceeifu bulk dust sample; the specific {bma ofaystullinc silica can not be iletermined. Hence, alpha-quartz, the most prevalent form of crystalline silica, will be assumed. = Less than the sVitcd value TItc lowest reportable value is oquivalenl to the Analytical Sensitivity wluch is calculated from the lowest reproducible concentrarinn of silica deieciablc by the instrument. ■NIHa Accredited - Laboratory ID //100192

CONFIDENTIAL, CITY_21MC100_003423315

SUBJECT TO PROTECTIVE ORDER NO, 2, SEPT. 2008

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